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Applications of -grams in textual information systems (1998)

Robertson, Alexander M. ; Willett, Peter

Bradford : Emerald

Journal of documentation 54 (1998), S. 48-67

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ISSN: 0022-0418

Source: Emerald Fulltext Archive Database 1994-2005

Topics: Information Science and Librarianship

Notes: This paper provides an introduction to the use of n-grams in textual information systems, where an n-gram is a string of n, usually adjacent, characters extracted from a section of continuous text. Applications that can be implemented efficiently and effectively using sets of n-grams include spelling error detection and correction, query expansion, information retrieval with serial, inverted and signature files, dictionary look-up, text compression, and language identification.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1108/EUM0000000007161

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Retrieval Of Morphological Variants In Searches Of Latin Text Databases (1997)

Schinke, Robyn ; Greengrass, Mark ; Robertson, Alexander M. ; [et al.]

Springer

Computers and the humanities 31 (1997), S. 409-432

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ISSN: 1572-8412

Keywords: conflation algorithm ; Hartlib Papers Collection ; Latin ; Patrologia Latina ; stemming ; text databases

Source: Springer Online Journal Archives 1860-2000

Topics: Computer Science , Media Resources and Communication Sciences, Journalism

Notes: Abstract This paper reports a detailed evaluation of the effectiveness of a system that has been developed for the identification and retrieval of morphological variants in searches of Latin text databases. A user of the retrieval system enters the principal parts of the search term (two parts for a noun or adjective, three parts for a deponent verb, and four parts for other verbs), this enabling the identification of the type of word that is to be processed and of the rules that are to be followed in determining the morphological variants that should be retrieved. Two different search algorithms are described. The algorithms are applied to the Latin portion of the Hartlib Papers Collection and to a range of classical, vulgar and medieval Latin texts drawn from the Patrologia Latina and from the PHI Disk 5.3 datasets. The effectiveness of these searches demonstrates the effectiveness of our procedures in providing access to the full range of classical and post-classical Latin text databases.